9991349 has 2 divisors, whose sum is σ = 9991350. Its totient is φ = 9991348.

The previous prime is 9991343. The next prime is 9991357. The reversal of 9991349 is 9431999.

9991349 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7980625 + 2010724 = 2825^2 + 1418^2 .

It is a cyclic number.

It is not a de Polignac number, because 9991349 - 2¹² = 9987253 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9991343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4995674 + 4995675.

It is an arithmetic number, because the mean of its divisors is an integer number (4995675).

Almost surely, 2^9991349 is an apocalyptic number.

It is an amenable number.

9991349 is a deficient number, since it is larger than the sum of its proper divisors (1).

9991349 is an equidigital number, since it uses as much as digits as its factorization.

9991349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 78732, while the sum is 44.

The square root of 9991349 is about 3160.9095210082. The cubic root of 9991349 is about 215.3813243643.

The spelling of 9991349 in words is "nine million, nine hundred ninety-one thousand, three hundred forty-nine".